Hi,
we are using Samba version 3.0.13 on Solaris 7 and 8 and we have still some
problems with opening MS Powerpoint 2000 and MS Project 2000 documents.
If the samba server has no root permissions on the NFS share, it is not
possible as a user (not owner) of a group with write permissions to save the
Powerpoint document. By a MS Project document gets an error message, but
saving is possible.
So it looks like a "su" on the user is not working in Samba. In Samba version
2.2.8a it works without problems.
-- Kind regards
Michaela

I've a similar bug, with Powerpoint XP
you can do the following check in Powerpoint:
Tools, Options, Security, Privacy options, check "Remove personal information
from file properties on save"
then in:
Tools, Options, General, User information
set the same user information for all the workstation
this isn't not intended to be used, because when user A is working in foo.ppt
and user B is trying to open it, it'll write: "The document is write protected
by TheNameThatAllWorkstationHave", which doesn't tell you who is locking it.

Have you tried with a new .ppt file? This will not work with an existing one
with the problem.
The file should be created with your "shared user" information.
Then all the others workstation configured with this "shared user" information
in Powerpoint should be able to write in it
I'll try to post the problem on the mailing-list to give it more visibility
since the bug was present in 3.0.11 and still is present with 3.0.20pre1